l carnitine effective dose L-Carnitine and Male Fertility: Is Supplementation Beneficial? Doctor's Best Acetyl-L-Carnitine, 1000 mg

Longitudinal neurochemical modifications in the aging mouse brain measured in vivo by 1H magnetic resonance spectroscopy

Yin, Y., Zhou, E

Together, they form a multi-layered defense system

In an often-cited 1993 study, GHK-Cu increased the accumulation of connective tissue in experimental wounds in rats, supporting a real role in repair

Controlled human trials exist, but they're limited in size, focused mostly on topical cosmetic use, and usually last only a few weeks or months. That means a lot of the exciting claims, especially around gene expression, systemic repair, and anti-aging effects, haven't been confirmed in large-scale human studies